CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Peng Wang,Jian Sun,Yafei Guo,Chuanwen Zhao,Weiling Li,Guodong Wang,Su Lei,Ping Lu
The development of K 2 CO 3 -based sorbents with desirable CO 2 capture capacity and mechanical property is highly necessary for its large-scale application. In this work, a range of extruded-spheronized K 2 CO 3 -based pellets containing different K 2 CO 3 loading (30–70 wt%) and Al 2 O 3 -based supports (i.e., activated alumina, Bayer aluminum hydroxide, kaolinite clay and calcium aluminate cement) were prepared for CO 2 capture. It is found that the distinct textural properties of different supports result in the obvious diversities in CO 2 uptake and mechanical property of K 2 CO 3 -based pellets. The activated alumina-supported sorbent pellets loaded with 50 wt% of K 2 CO 3 possess the highest CO 2 adsorption capacity of 2.29 mmol/g. It is mainly attributed to the moderate amounts of active component contributing to good textural properties and abundant CO 2 -philic sites, whereas excessive K 2 CO 3 loading will cause the destruction of porous structure, consequently the inferior CO 2 uptake. Moreover, the addition of 15 wt% of urea can furher enhace CO 2 uptake of the activated alumina-supported sorbent pellets loaded with 50 wt% of K 2 CO 3 , ∼3.10 mmol CO 2 /g. The improved CO 2 uptake is due to the significantly enhanced porosity of sorbent pellets as a result of urea decomposition. In addition, the urea-templated sorbent pellets still maintain the high compressive strength (18.96 MPa) and good attrition resistance (a weight loss of 0.59% after 4000 rotations).
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Xulong Chen,Wenping Hu
Resource scarcity and environmental degradation pose formidable challenges for the sustainable development of human society. Although enhancing resource utilization efficiency represents a viable solution to these challenges, many strategic resources still suffer from substantial waste and environmental pollution owing to their single utilization form and non-environmentally friendly technologies. In this study, by employing salt lake carnallite as a representative example, we proposed an eco-friendly closed-loop strategy that integrated various chemical processes to maximize resource utilization. This innovation enables successive recycling and utilization of the waste brine generated at each chemical stage, resulting in minimized resource wastage and maximized eco-environmental benefits. Compared with the conventional carnallite utilization method, our strategy enhanced the KCl yield from 55.48% to 89.25%, achieved nearly 100% utilization efficiency of Mg, and improved the Rb recovery efficiency from 0% to 81.28%. Consequently, the overall utilization efficiency of carnallite increased from 20.91% to 87.37%. Additionally, this approach offers the added benefit of significantly improving the overall utilization of mineral resources and substantially reducing the cost of large-scale sample preparation. This work helps to construct a more sustainable and cost-effective utilization system for various mineral and brine resources.
研究领域:
化学工程
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环境科学
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矿业工程
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产品关联
DOI
高影响因子
DALTON TRANSACTIONS
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2019
·Vol. 49
·期 13
·3965-3969
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IF 4.052
Suying Wang,Zhengwen Liu,Andrew T. Smith,Yanxian Zeng,Luyi Sun,Weixing Wang
Dry hydrated potassium carbonate (DHPC) is a free-flowing powder prepared by uniformly mixing hydrated K2CO3 and hydrophobic nanosilica. We demonstrated that DHPCs can absorb CO2 rapidly because of their high surface-to-volume ratio. Their CO2 capture performance is superior to that of 30 wt% monoethanolamine (MEA), an industry standard. DHPC-75 (containing 75 wt% K2CO3) has a CO2 uptake capacity of 233 mg g−1 (90% saturation uptake within 13 min), higher than the widely used 30 wt% MEA aqueous solution (111 mg g−1, 90% saturation uptake within 25 min). DHPC-75 also exhibits an excellent cycling performance, thus becoming a promising candidate for practical application.
研究领域:
化学工程
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环境科学
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Wenjie Ma,Jialuo Shan,Mengyao Wang,Jianhua Xie,Yi Chen,Nan Sun,Yiming Song,Xiaobo Hu,Qiang Yu
Chinese Jiuniang (CJ) is a flavorful and nutritious food, but underutilized in frozen dough (FD) production. In addition, frozen storage can harm FD's gluten structure and degrade quality and flavor. Therefore, the impacts of two excellent protective agents (XG-Xanthan Gum; PC-Potassium Carbonate) on frozen Jiuniang dough (F-JD) quality and flavor during dynamic freezing were investigated. The results suggested that adding XG conferred F-JD with good processing stability, maintained the bound water levels, stabilized rheological properties, diminished ice crystal damage to the protein structure, and inhibited the increase in frozen water content during the freezing process. In contrast, although PC reduced free water production during freezing, it increased dough hardness and offered less protein protection than XG . Additionally, GC-QTOF/MS analysis showed that adding XG during freezing increased the relative content of pleasant flavor compounds like Phenylethyl Alcohol and decreased undesirable ones like Hexanal. Moreover, PC lowered the relative content of undesirable flavor substances (Formic acid) but reduced the relative content of beneficial flavor compounds (1-Hexanol). Importantly, the study confirmed that XG maintained the new F-JD product's storage quality during dynamic freezing. In conclusion, this study broadens CJ's application possibilities and provides new insights into mechanisms for preserving F-JD's quality and flavor.
研究领域:
食品科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
FUEL
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2017
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IF 4.601
Yafei Guo,Chuanwen Zhao,Jian Sun,Weiling Li,Ping Lu
Silica aerogel supported K 2 CO 3 sorbents with different K 2 CO 3 loadings were synthesized by sol-gel and wet impregnation processes. The sorbents were characterized by N 2 adsorption-desorption, X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM) techniques. CO 2 capture performances of the sorbents were tested in a simulated ultra-dilute flue gas stream of 1.0%CO 2 and 2.0%H 2 O at 20 °C, using a fixed-bed reactor coupled with an online infrared gas analyzer. Sorbent regeneration performances of the samples were evaluated in a pure N 2 atmosphere at 200 °C with a heating rate of 10 °C/min. CO 2 capture capacity and K 2 CO 3 utilization efficiency increased first and then decreased with the increase in K 2 CO 3 loading. The desired sorbent with 20 wt% K 2 CO 3 was screened for investigating the effects of acid impurities. The presence of 500 ppm SO 2 and 500 ppm NO in the simulated flue gas stream was found to adversely affect the CO 2 capture, sorbent regeneration and multiple cyclic performances. Detailed mechanisms of the irreversible sorbent deactivation process were discussed. SO 2 could be chemically absorbed by K 2 CO 3 under a moist condition to form byproduct of K 2 SO 3 ·H 2 O, and the byproduct was stable and would be accumulated in the sorbent during the repeated cycles. This further attenuated the physical properties and K 2 CO 3 utilization efficiency of the sorbent. These results would lay a solid foundation for further application of the sorbent in ultra-dilute flue gas treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Lihua Zhang,Yuli Ning,Yinjiao Wei,Yingying Xin,Bakht Ramin Shah,Hongtao Du,Jian Zou,Wei Xu
Konjac glucomannan (KGM) undergoes deacetylation in alkaline conditions, while κ-carrageenan (CRG) is sensitive to potassium ions. This study examines the influence of K 2 CO 3 on the mechanical properties of KGM/CRG-based camellia oil Pickering emulsion gels. Texture analysis and rheological testing revealed that the addition of K 2 CO 3 significantly enhanced the mechanical properties of emulsion gels. Texture parameters, such as the hardness, gumminess, and chewiness of the gel, were closer to those of pork back fat when the K 2 CO 3 concentration was 0.2 M. The addition of K 2 CO 3 enhance the intermolecular crosslinking within the gel and formed a more uniform and dense gel network, promoting gelation and structural stability, which were confirmed by Fourier transform infrared spectroscopy, X-ray diffraction, and microstructural analysis. Besides, low-field nuclear magnetic resonance and thermogravimetric analyses indicated that the addition of K 2 CO 3 reduced the water mobility of the gel and improved its thermal stability. Physicochemical and color analysis results showed that the energy value of the camellia oil Pickering emulsion gel was only 15.9 % that of pork back fat, and its appearance was closer to that of pork back fat than hydrogels. This study provides technical support for the use of KGM/CRG-based camellia oil Pickering emulsion gels as fat analogs.
研究领域:
食品科学
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生物化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2015
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IF 4.321
Yajuan Ma,Bing Liu,Mengmeng Jing,Renyuan Zhang,Junyu Chen,Yuhua Zhang,Jinlin Li
In this work, we have prepared several kinds of potassium salts doped Ru/AC catalysts and systematically studied their catalytic activities towards water–gas shift (WGS) reaction. Activity testing indicated that K 2 CO 3 doped Ru/AC catalyst (Ru-K 2 CO 3 /AC) showed higher catalytic performance than KOH and KOAc doped Ru/AC catalysts, methane selectivity decreased most after doping KOH. Although the particle size of Ru nanoparticles in Ru-K 2 CO 3 /AC catalyst was larger than that of the parent Ru/AC catalyst, H 2 -TPR indicated that RuO x was reduced at much lower temperature, suggesting a weaker interaction between RuO x and the surface functional group of active carbon after the doping of K 2 CO 3 . Thus, Ru nanoparticles interacted stronger with the reaction molecules (CO and H 2 O), leading a higher catalytic activity. In addition, the doping of K 2 CO 3 on the surface of Ru/AC catalyst also increased the concentration of water around Ru active site due to the hygroscopic ability. Interestingly, it was also found that the prepared method also greatly affected the catalyst activity. If the active carbon was firstly coated with K 2 CO 3 , followed deposition of Ru metal nanoparticles, (called Ru/K 2 CO 3 -AC catalyst), the activity decreased remarkably as compared to Ru-K 2 CO 3 /AC. The low catalytic activity of Ru/K 2 CO 3 -AC was mainly due to the aggregation of Ru nanoparticles.
研究领域:
催化化学
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能源材料科学
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产品关联
DOI
高影响因子
Food Bioscience
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2023
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IF 5.2
Qiuhong Huang,Qi Sun,Zhongyue Tang,Xuefeng Zeng
The value-added utilization of okara is restricted by the large particle size and high cost of microfabrication means. In this study, the changes of particle size and dietary fiber content of okara treated with K 2 CO 3 are investigated, and the effects of micronized okara(MO)(0%, 8%, 16%, 24%) on the physicochemical quality and in vitro starch digestion of rice tofu(RT) are further explored. The particle size of okara varied from 458.24 μm to 37.06 μm by being treated with K 2 CO 3 . The quality results of microfined okara rice tofu (MO-RT) products showed that dietary fiber and yield increased gradually while whiteness decreased. In addition, texture profile analysis results revealed that MO enhanced the viscosity of RT, but decreased the hardness, cohesiveness and chewiness . SEM results revealed that MO (8%, 16%) could combine well with starch gel. Meanwhile, adding MO significantly increased the resistant starch (RS) of RT and decreased the predicted glycemic index (p GI). XRD and FTIR indicated that the addition of MO increased the crystallization area and changed the multi-scale structure. Therefore, the present study proposed a low-cost and safe method of reducing the particle size of okara, and presented the potential to change the physicochemical quality and starch digestion of rice tofu.
研究领域:
食品科学
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营养学
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DOI
高影响因子
PHARMACEUTICAL CHEMISTRY JOURNAL
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2017
·Vol. 51
·期 6
·491-493
·
IF 0.445
Zhu Jian,Jin Zhi-Min
Insoluble camptothecin was converted into the corresponding hydrosoluble analog, camptothecin carboxylate, by using 1,1,3,3-tetramethylguanidine as hydrolyzing agent. The ethanol/K 2 CO 3 /H 2 O aqueous two-phase system was established to extract the hydrosoluble camptothecin carboxylate. Through two-stage extraction from crude camptothecin of 5.4%, purity, final hydrosoluble camptothecin was obtained with a purity of 98.5% at a total yield of 78.4%.
研究领域:
药物化学
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分离工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Pengxin Zeng,Chuanwen Zhao,Chenxi Liang,Peiyu Li,Haoxuan Zhang,Ruilin Wang,Yafei Guo,Hongqiang Xia,Jian Sun
K 2 CO 3 -based adsorbent pellets produced by graphite-casting method are promising alkali metal-based solid CO 2 adsorbents. The incorporation of porous metal oxide supports is an effective to enhance CO 2 adsorption capacity of K 2 CO 3 -based adsorbent pellets. In this work, graphite-casted K 2 CO 3 -based adsorbent pellets incorporated with different porous supports (i.e., TiO 2 , ZrO 2 , and SiO 2 ) were prepared for CO 2 capture. Comparatively, the ZrO 2 -supported, K 2 CO 3 pellets loaded with 30 wt% of K 2 CO 3 exhibit the highest CO 2 adsorption capacity, approximately 0.93 mmol/g. For the SiO 2 -supported K 2 CO 3 adsorbent pellets, the high calcination temperature (>700 °C) required to remove the graphite layer covering the pellet surface will cause the formation of new eutectics (i.e., K 2 Si 2 O 5 and K 2 Si 4 O 9 ), which leads to the collapse of the adsorbent pellets. Low calcination temperature of 500 °C can avoid the collapse of the SiO 2 -supported K 2 CO 3 adsorbent pellets and remove most of the graphite on the surface. Moreover, the CO 2 adsorption capacity can be further increased to 1.30 mmol/g by adding 20 wt% of microcrystalline cellulose to the SiO 2 -supported K 2 CO 3 adsorbent pellet. Although the adsorption capacity of structurally improved, SiO 2 -supported K 2 CO 3 pellets is still inferior to that of structurally improved, ZrO 2 -supported K 2 CO 3 pellets, they exhibit great cost advantage. Therefore, SiO 2 -supported K 2 CO 3 pellets with 20 wt% of microcrystalline cellulose have industrial application prospects.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2024
·Vol. 50
·期 7
·3391-3409
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IF 2.8
Jiang Shan,Wang Rui,Jin Changzi,Li Fei,Jiang Heng
The solid–liquid phase transfer catalyzed (S-L PTC) properties of polyethylene glycol (PEG) were investigated in the preparation of dialkyl disulfide (R 2 S 2 ) by oxidative coupling of alkyl mercaptan and sulfur with K 2 CO 3 as catalyst under atmospheric pressure and solvent-free conditions. The results have showed that the S-L PTC properties of PEG are not significantly different from those of crown ether. The S-L PTC properties of PEG are reduced due to methylation of the terminal hydroxyl groups, indicating that the terminal hydroxyl group in PEG plays an important role in stabilizing the [PEG-K 2 + CO 3 2− ] complex. The results of infrared spectral analysis confirm that CO 3 2− in K 2 CO 3 has a strong interaction with the terminal hydroxyl group in PEG. At the fixed molar ratio of –CH 2 CH 2 O-/K 2 CO 3 , the increase of PEG chain length has a positive correlation with the S-L PTC performance. The reaction rate and yield of R 2 S 2 can be improved by increasing the amount of K 2 CO 3 and the molar ratio of -CH 2 CH 2 O-/K 2 CO 3 appropriately. The PEG400/K 2 CO 3 system exhibits very high catalytic activity for the oxidative coupling reaction of alkyl mercaptan with sulfur as oxidant. The yield of the reaction product ( n -C 8 H 17 ) 2 S 2 can still reach more than 97% by using 0.1 mol% K 2 CO 3 and 0.006 mol% PEG400 (based on sulfur). Graphical Abstract
研究领域:
化学工程
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材料科学
✓ 已验证
DOI
高影响因子
ENERGY & FUELS
·
2016
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IF 2.835
Qiangwei Li,Yi Wang,Shanlong An,Lidong Wang
Using a K2CO3/piperazine (PZ) mixture as a typical phase-change absorbent has promising applicability for carbon dioxide (CO2) capture in coal-fired power plants that would contribute to low energy consumption for solvent regeneration. In this study, the reaction rate of CO2 with a concentrated K2CO3/PZ mixture was measured in a wetted-wall column. At a CO2 loading close to saturation absorption, correlative physical parameters were calculated. The effects of operating conditions, including gas flow rate, slurry flow rate, PZ concentration, CO2 loading, K2CO3 mass fraction, and temperature, on the absorption rate of CO2 were investigated. The results showed that the absorption rate was sensitive to the effects of the gas flow rate and CO2 loading. The PZ concentration and K2CO3 mass fraction also substantially influenced the CO2 absorption rate. However, minor changes in the CO2 absorption rate were observed when the slurry flow rate and temperature were increased. On the basis of a pseudo-first-order model, the absorption rate determined in this study was found to be controlled by mass transfer in both the gas film and the liquid film. The results can serve as a useful reference for designing CO2 removal systems using K2CO3/PZ mixtures.
研究领域:
化学工程
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环境科学
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能源技术
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气体分离
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工业催化
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）